generated by a NEC projector (NEC Corporation, Tokyo, Japan) working at 60 Hz refreshment rate, projected outside the scanner onto a translucent screen placed at the end of the scanner bore, and visible to the subject via a mirror attached to the head coil. Since the time instant of the stimulus presentation could be delayed with respect to the trigger delivery (time range 50–100 ms), the exact stimulation timing was monitored by means of a photoelectric cell placed onto the screen. The simultaneous EEG–fMRI recording lasted about 8 min.
